Fuel Tank Solenoid Valve - Replacement

Number: 93-90-6C

Section: 6C

Date: JAN. 1993

Corporate Bulletin No.: 266307

ASE No.: A1, A8

Subject:
NATURAL GAS VEHICLE (NGV) FUEL TANK SOLENOID VALVE REPLACEMENT

Model and Year:
1992-93 C2 TRUCKS WITH DEDICATED NGV SYSTEM

The in-tank fuel solenoid valves are replaceable on the 1992-93 2500 Natural Gas Vehicle (NGV) trucks by performing the following:

1. Remove the shield from the fuel tank that needs the in-tank solenoid valve replaced.

2. Open the fitting of the shortest line at the four-way "tee" connector at the fill side of the lines leading into the fuel tanks. See C-K Models Service Manual Supplement (Covering Natural Gas Models), Page 4-7, Fuel Control Section, Fig. 4-6.

CAUTION:
The gas will escape under high pressure for a brief moment. Wear eye protection and keep face and skin away from the area of escaping gas.

The overflow feature of the in-tank solenoid will stop the flow of gas.

3. Disconnect the electrical connector and the fitting to the fill side of the in-tank solenoid valve to be removed.

4. Attach Kent Moore tool # J-39711 to the fill side of the in-tank solenoid valve and move the truck outdoors to vent the fuel.

CAUTION:
Ground the over-temperature/over-pressure relief valve at the rear of the tank to a known good earth ground. This will prevent the buildup of static electricity while releasing the tank pressure.

5. Turn the handle on the Kent-Moore tool # J-39711 counter-clockwise to drain the fuel from the tank.

NOTE:
Ice may form on the valve and stop the flow; DO NOT attempt to melt the ice. Let it thaw naturally and the flow will continue.

6. When the tank is empty remove the outlet line from the in-tank solenoid valve.

7. Remove the valve by rotating it counter-clockwise to unscrew it from the tank.

8. Lightly grease the seal on the new valve (P/N 12540064) with petroleum jelly and install it into the tank. Tighten to 35 lbs.ft. (47.5 N-m).

9. Reinstall the electrical connector and the inlet and outlet lines to the valve.

10. Reinstall the shields on the fuel tank.